Detailed explanation of php array_unshift() function (example)

array_unshift() function is used to insert new elements into the array and return the number of elements in the new array. The values ​​of the new array will be inserted at the beginning of the array.

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Tip: You can insert one or more values. Numeric key names will start at 0 and increase by 1. String key names will remain unchanged.

Function syntax:

array_unshift(array,value1,value2,value3...)

Parameter description:

• array Required. Specifies an array.

• #value1 Required. Specifies the value to be inserted.

• #value2 Optional. Specifies the value to be inserted.

• #value3 Optional. Specifies the value to be inserted.

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Example:

"red","b"=>"green");
array_unshift($a,"blue");
print_r($a);
?>

Run result:

Array ( [0] => blue [a] => red [b] => green )

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